Feed-valve mechanism for oil burners



sept. 21,1926. A A 1,600,507

E. MARR l'FFED vALvE uEcHANsu ,Fon on. unuans Filed August 5, 1925Patented Sept. 21, 1926.

l .UNITED STATES A, 1,600,507 Param ori-fics.

EARL MARR, OF MINNEAPOLIS, MINNESOTA, ASSIGNOR'TOMARR OIL HEAT MACHINE ACORPORATION, OF MINNEAPOLIS, MINNESOTA, A CORPORATION OF MINNESOTA. -1

FEED-VALVE MECHANISM FOR OIL BURNERS.

Application filed August 3, 1925. Serial No. 47,776. Y

My invention provides an improved feed valve mechanism especiallyadapted for use in connection with oil burners wherein a fan or blowervand an oil pump are used to produce forced feed of air and oil.Generally stated, the invention consists of the novel devices,combinations of devices and arrangement of parts hereinafter describedand defined in the claims.

It has been a difficult matter to provide a satisfactory oil or fluidfuel feeding depassage that such small impurities contained in the oilor fluid fuel. If larger feed passages be provided and left constantlyopen, then the supply of oil could not be cut down to the required smallflow. I have, however, provided a valve mechanism wherein *relativelylarge ports may be used and these ports brought into registrationintermittently and'for only a portion of the time, but in such rapidsuccession that the flow of oil to the burner, for all intents andpurposes, would be substantially continuous.

f A second feature of the invention resides u in the provision of agovernor-controlled choke valve in the fuel or oil feed passage, thegovernor being driven by the same motor that drives the fan or blowerand arranged to open the choke valve when the motor is in action, and toclose the choke valve when the motor and In the accompanying drawings,which ili lustrate the invention, like characters indicate like partsthroughout the several views.

Referring to the drawings:

Fig. 1 is a vertical-section taken axially through the improved feedvalve mecha- Fig. 2 is section on the line 2 2 of' Figa 1;

the blower are idle or'stopped.

showing al Fig. 1, some parts being broken disposed cup-shaped shell 5.Said membersil' i and `are provided with axially aligned proJectingbearing hubs 6 and 7, respectiveily.l As shown in Fig. V1, the flangedbase of the head his secured to 'a casting or Vsupport18, the nature ofwhich, for the purpose of this case, need not be considered. The

bearing hub 6 is madehollow'to afford an.

oil-receiving chamber 9, and the oil under pressure is fed into thischamber 9 throughv an oil pipe 10. Rigidly secured to the inner face ofthe head plate 4 is a disc-like valve seat 11 provided with achub thatis axially aligned with the hub-,6. A motor or power-driven shaft 12,which, in practice. 'will be arranged to be rotated when the fany orblower (not shown) vof the burner is in action, is` extended through andj'ournaled in the hub 6 and in the hub of the valve seat 11. Keyed torotate with the shaft 12 but capable of slight axial movementA is arotary disc-like feed valve 13, the face of which works in close contactagainst the face of the fixed valve seat 11. In the arrangement shown,the valve13 is pressed against its seat by' a coiled spring 14 placedaround the shaft 12 and reacting against the hub of lsaid valve andagainst a collar 15 fixed to said shaft. The valve 13 is provided with aport 16 oifset'froin its axis andarranged to register in ksuccessionwith circumferentially spaced ports 17 formed in the valve seat11. Theseports 17 mayy vary in number, but, as shown, they are located insubstantially diainetrically opposite groups, the 'one group consistingof three ports land the other of four ports; .Vorking against the innerface of the valve seat 11 is arotatively adjustable port cut-oft plate18 of annular form,

rotatively mounted onthe hub ofvsaid valve 2 seat and,'as shown,providedwith diametrically opposite segmental slots 19. As shown thecut-off plate 18 is frictionally pressed against lthe valve seat 11k bya spider-like spring washer-2O that is seated yagainst a nut 21 threadedon the hub of said'valve,l

seat.. Thus, the rotativelyadjustable port 'cut-off .plate 18 will befriction'allyfheld in any position in which set.l To facilitate rotaryadjustments of said plate 18, it is shown as vprovided witha notchedrim22 that `may be reached by a pointed tool inserted through anyopening normally closed by a plug 23 applied to the shell 5. In theadjustment shown iii Fig. 2, only one Vof the evident, affords' meansfor greatly varying thefeed of oil. The rate of the Voil feed will notbe varied to any perceptible extent per minute or any other unit of timeby` the varying speed of thevshaft 12, for if the speed of said shaft bedoubled, the interval of time during which the ports will register willbe reduced to one-half, but the number of port registrations per minuteor unit of time will be doubled. Hence, the rate of the oil feed may bevery accurately controlled bya-djustments of the cut-off plate. TWhenonly one port of the valve seat is opened by the cut-off plate, therewill be a very small or slow feed of the oil or fluid fuel, even whenthe fuel feed ports of the valve mechanisinare made as Alarge asone-eighth of an inch or more iii diameter and, as is evident, ports ofsuch size will not be clogged by anyimp'urities found in oil or fluidfuel.

Oil fed into the chamber 9 and through the ports of the valve mechanismjust above described will enter the interior of the shell 5,V and forthedischarge thereof from said shell, the hub of said shell is providedwith Y an axial discharge port 24 connected to an Voil delivery pipe 25.

Mounted on the reduced inner end of the shaft 12 for slight axialmovements isa needle valve 26. Secured to the shaft 12 within the shell5 is ay cup-shaped governor head'27 provided with internal lugs 28 towhich are pivoted governor levers 29, the short inwardly projecting endsof which engage a shoulderBO on the needle valve 26. A coiled spring`31,

Y placed around the shaft 12, acts against the hub of the head 27 andagainst the valve 26 and causes said valve to close said port 24;wheithe shaft 12 is at rest. When the shaft 12 is rotated at the properspeed to operate the fan or blower, centrifugal force,

acting on the head ends of the levers 29,

will'overconie the spring 31 and move the needle valve 26 in a positionto open the port 24 for maximum feeding capacity, so

that the vflow of oil will then be regulated i A'entirely by the feedvalve mechanism already clearlyY described.- Theobvious purpose of thisgovernor-actuated choke valve 26 is to positively 4cut olf 'the flow vorfeed of the oil or fluid fuel whenever'the motorV and, hence, the fan orblower are stopped. This positively prevents flooding of a burnrer`.when the motor of the burner installation is y stopped.

N hat Il claim is l. ln a device of the kind described, a relativelyfixed valve seat, a rotary `valve .cooperating therewith, said seat andvalve liavine' ecceiitrically locatedports arranged to be intermittentlybrought into registration under rotation of said valve, andmotoractuated means for rotating said valve.

2. A device of the kind described compris' a valve seat and acooperating rotary valve, said valve and seat havingv flat engagingfaces and formed with eccentrically l cated ports adapted to be broughtinto i'e. stration under rotation of said valve, the number of ports inone of the said meinbers being greater than the number of ports in theother member, and motor-actuated means foi' rotating said valve. c j

3. A device of the kind described comprisiiv^` a valve seat and acooperating rotary valve, said valve and seat having flat engaging facesand formed with eccentrically located ports adapted to be brought'intoregistration under rotation' of said valve, the number of ports in saidvalve seat being greater than the number of ports in said valve, andmotor-actuated means for rotating said valve.

11. The structure defined in'c'laim 2 in further combination with meansfor closing more or lessof saidzports to vary the flow.

5. A device ofthe kind Vdescribed comprising a valve seat and acooperating rotary valvel said valve and seat having flat engagingfacesiand formedwith eccentrically located ports adapted to be broughtinto registration under rotation of said valv-e,'the number of ports inlsaid valve seat being greater than the numberof ports in 'said valve,and ank adjustable port cut-off plate movable to open and close more orless of he ports of said valve seat. j j

6. In a device of the kind described, the combination with a relativelyfixed valve seat, of a rotary valve workingon one side of said valveseat, and a choke plate rotatively adjustable on the other side of saidvalve seat, said valve seat, valve and cutoff plate having ports andsaid cutoff' plate being adjustable to vary the flow through .said portswhen in registration.

.7. rlhe structure defined in claim 6 in further combination with aspring device for frictioiially holding said cut-off plate where set. fv

8. A fluid kow yfeeddevice comprising a relatively fixed disc-like.valve seat. a disclike rotary valve, and a rotatively adjustablecut-off-plate, said valve seat being between said valve and cut=o1i`plate, said three ele- 'ments having cooperating ports, and vsaidcut-off plate being adjustable to vary the i'ioi'v-oonducting capacityof said ports when iii registration. 'v Y 9. The combination with acontainer having inlet and discharge `ports for the circulation of afluid therethrough, of a shaft extended into said container, a valve anda valve seat in said container having cooperating ports for controllingthe How of fluid` cause the same to open to said discharge port Whensaid shaft -is rotated.

10. The combination with a container having inlet and discharge portsfor the circulation of Huid therethrough, a feed valve and a valve seathaving co-operating ports controlling the extent of flow through saidcontainer, a choke valve for cutting oi and releasing the How throughsaid container, a governor for actuating said choke valve, and means forsimultaneously driving said governor and feed valve.

i 11. The combination with la container having inlet and discharge portsfor the circulation of fluid therethrough, a feed valve and a valveseat, said valve and seat having co-operating eccentrically locatedports controlling the extent of lovv. through said container but movableto release the flow, a centrifugal governor operative at a predeterminedspeed to move said` choke valve to an open position` and means forsimultaneously rotating said governor and valve.

12. The combination With a container having inlet and discharge portsfor the circulation of uid therethrough` driven flow-controlling meansprimarily controlling the flow through said container when in action, achoke valve for cutting off and releasing the How though said container,a governor for actuating said choke valve, and :means for simultaneouslydriving said governor and flow-controlling means.

In testimony whereof I aHiX my signature.

EARL MARR.

